diff --git a/gst-plugin-audiofx/src/audioecho.rs b/gst-plugin-audiofx/src/audioecho.rs
index dfb1bcc6..da7687e2 100644
--- a/gst-plugin-audiofx/src/audioecho.rs
+++ b/gst-plugin-audiofx/src/audioecho.rs
@@ -253,11 +253,11 @@ impl BaseTransformImpl<RsBaseTransform> for AudioEcho {
 
         match state.info.format() {
             gst_audio::AUDIO_FORMAT_F64 => {
-                let mut data = map.as_mut_slice().as_mut_slice_of::<f64>().unwrap();
+                let data = map.as_mut_slice().as_mut_slice_of::<f64>().unwrap();
                 Self::process(data, state, &settings);
             }
             gst_audio::AUDIO_FORMAT_F32 => {
-                let mut data = map.as_mut_slice().as_mut_slice_of::<f32>().unwrap();
+                let data = map.as_mut_slice().as_mut_slice_of::<f32>().unwrap();
                 Self::process(data, state, &settings);
             }
             _ => return gst::FlowReturn::NotNegotiated,